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[BGL] null edge descriptor
by Ireneusz Szcześniak 01 May '17

01 May '17

Hi, I'm using Boost Graph Library (BGL), and I need a null edge. For years I was using G::edge_descriptor(), i.e., a default-constructed edge descriptor, and the code was working. However, I wonder if it is correct. Are all default-constructed edges equal? If I get a default-constructed edge descriptor e1 at some point in code, and another default-constructed edge descriptor e2 at some other point in code, will there descriptors always equal, i.e., will e1 == e2 always hold? Is it guaranteed that a default-constructed edge does not refer to an existing edge in a graph? Best, Irek

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[review] Review of PolyCollection will start in a few days
by Ion Gaztañaga 30 Apr '17

30 Apr '17

Dear Boost community, The formal review of Joaquín M López Muñoz's PolyCollection library will start on Wednesday, May 3rd and ends on May 12th. This library implements fast containers of polymorphic objects. Typically, polymorphic objects cannot be stored directly in regular containers and need be accessed through an indirection pointer, which introduces performance problems related to CPU caching and branch prediction. Boost.PolyCollection implements a novel data structure that is able to contiguously store polymorphic objects without such indirection, thus providing a value-semantics user interface and better performance. Three polymorphic collections are provided: * boost::base_collection * boost::function_collection * boost::any_collection dealing respectively with classic base/derived or OOP polymorphism, function wrapping in the spirit of std::function and so-called duck typing as implemented by Boost.TypeErasure. If you are interested, you can start preparing your review with the following information: Repositories: Incubator: http://blincubator.com/bi_library/polycollection/?gform_post_id=1643 Github: https://github.com/joaquintides/poly_collection and the documentation here: http://rawgit.com/joaquintides/poly_collection/website/doc/html/index.html See you on Wednesday! Ion

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Fwd: [boost] [clang] clang-cl expansion of macros
by degski 29 Apr '17

29 Apr '17

On 16 April 2016 at 17:58, Edward Diener <eldiener(a)tropicsoft.com> wrote: > What I strongly suspect will finally happen is that clang will not fix > these emulation problems because they are too tricky and numerous to do. > Instead they will probably declare that their emulation is good enough for > the majority of preprocessor constructs and that Boost PP, which pushes the > preprocessor to its limits, is not meant to work with their flawed VC++ > emulation. I hope I am wrong about that supposition, but having spent much > time in Boost PP and Boost VMD trying to workaround VC++ non-standard > preprocessor behavior I can envision that having to code "down" to that > behavior in numerous complicated instances will be too much time consuming > work for the clang developers who have chosen to work with VC++ > preprocessor emulation. > I've successfully built boost-1.64 with VC1410 (from the developer command prompt). Trying to use boost with a project using Clang 4.0.0 (both the LLVM and C2 backends) gives me the following PP error messages: 1>------ Rebuild All started: Project: test, Configuration: Debug x64 ------ 1> In file included from test.cpp:16: 1> In file included from z:\vc\x64\include\boost/filesystem.hpp:16: 1> In file included from z:\vc\x64\include\boost/filesystem/path.hpp:28: 1> In file included from z:\vc\x64\include\boost/ iterator/iterator_facade.hpp:12: 1> In file included from z:\vc\x64\include\boost/ iterator/interoperable.hpp:11: 1> In file included from z:\vc\x64\include\boost/mpl/or.hpp:43: 1> In file included from z:\vc\x64\include\boost/mpl/ aux_/include_preprocessed.hpp:37: 1>z:\vc\x64\include\boost/mpl/aux_/preprocessed/plain/or.hpp(59,7): error : too many arguments provided to function-like macro invocation 1> 2 1> ^ 1> z:\vc\x64\include\boost/preprocessor/facilities/expand.hpp(26,10): note: macro 'BOOST_PP_EXPAND_I' defined here 1> # define BOOST_PP_EXPAND_I(x) x 1> ^ 1> In file included from test.cpp:16: 1> In file included from z:\vc\x64\include\boost/filesystem.hpp:16: 1> In file included from z:\vc\x64\include\boost/filesystem/path.hpp:28: 1> In file included from z:\vc\x64\include\boost/ iterator/iterator_facade.hpp:12: 1> In file included from z:\vc\x64\include\boost/ iterator/interoperable.hpp:11: 1> In file included from z:\vc\x64\include\boost/mpl/or.hpp:43: 1> In file included from z:\vc\x64\include\boost/mpl/ aux_/include_preprocessed.hpp:37: 1>z:\vc\x64\include\boost/mpl/aux_/preprocessed/plain/or.hpp(58,1): error : expected a qualified name after 'typename' 1> BOOST_MPL_AUX_NA_SPEC2( 1> ^ 1> z:\vc\x64\include\boost/mpl/aux_/na_spec.hpp(166,44): note: expanded from macro 'BOOST_MPL_AUX_NA_SPEC2' 1> #define BOOST_MPL_AUX_NA_SPEC2(i, j, name) \ 1> ^ 1> z:\vc\x64\include\boost/mpl/aux_/na_spec.hpp(64,11): note: expanded from macro '\ 1> 1> BOOST_MPL_AUX_NA_SPEC_MAIN' 1> BOOST_MPL_PP_PARAMS(i, typename T) \ 1> ^ 1> z:\vc\x64\include\boost/mpl/aux_/preprocessor/params.hpp(58,11): note: expanded from macro 'BOOST_MPL_PP_PARAMS' 1> , BOOST_MPL_PP_AUX_PARAM_FUNC \ 1> ^ 1> In file included from test.cpp:16: 1> In file included from z:\vc\x64\include\boost/filesystem.hpp:16: 1> In file included from z:\vc\x64\include\boost/filesystem/path.hpp:28: 1> In file included from z:\vc\x64\include\boost/ iterator/iterator_facade.hpp:12: 1> In file included from z:\vc\x64\include\boost/ iterator/interoperable.hpp:11: 1> In file included from z:\vc\x64\include\boost/mpl/or.hpp:43: 1> In file included from z:\vc\x64\include\boost/mpl/ aux_/include_preprocessed.hpp:37: 1>z:\vc\x64\include\boost/mpl/aux_/preprocessed/plain/or.hpp(58,1): error : expected ',' or '>' in template-parameter-list 1> z:\vc\x64\include\boost/mpl/aux_/na_spec.hpp(166,44): note: expanded from macro 'BOOST_MPL_AUX_NA_SPEC2' 1> #define BOOST_MPL_AUX_NA_SPEC2(i, j, name) \ 1> ^ 1> z:\vc\x64\include\boost/mpl/aux_/na_spec.hpp(65,9): note: expanded from macro '\ 1> 1> BOOST_MPL_AUX_NA_SPEC_MAIN' 1> BOOST_MPL_PP_NESTED_DEF_PARAMS_TAIL(i, typename T, na) \ 1> ^ 1> z:\vc\x64\include\boost/mpl/aux_/preprocessor/def_params_tail.hpp(97,5): note: expanded from macro 'BOOST_MPL_PP_NESTED_DEF_PARAMS_TAIL' 1> BOOST_MPL_PP_DEF_PARAMS_TAIL_IMPL(i, param, BOOST_PP_IDENTITY(=value)) \ 1> ^ 1> note: (skipping 2 expansions in backtrace; use -fmacro-backtrace-limit=0 to see all) 1> z:\vc\x64\include\boost/preprocessor/cat.hpp(22,32): note: expanded from macro 'BOOST_PP_CAT' 1> # define BOOST_PP_CAT(a, b) BOOST_PP_CAT_I(a, b) 1> ^ 1> z:\vc\x64\include\boost/preprocessor/cat.hpp(31,53): note: expanded from macro 'BOOST_PP_CAT_I' 1> # define BOOST_PP_CAT_I(a, b) BOOST_PP_CAT_II(~, a ## b) 1> ^ 1> <scratch space>(8,1): note: expanded from here 1> BOOST_PP_REPEAT_1 1> ^ 1> In file included from test.cpp:16: 1> In file included from z:\vc\x64\include\boost/filesystem.hpp:16: 1> In file included from z:\vc\x64\include\boost/filesystem/path.hpp:28: 1> In file included from z:\vc\x64\include\boost/ iterator/iterator_facade.hpp:12: 1> In file included from z:\vc\x64\include\boost/ iterator/interoperable.hpp:11: 1> In file included from z:\vc\x64\include\boost/mpl/or.hpp:43: 1> In file included from z:\vc\x64\include\boost/mpl/ aux_/include_preprocessed.hpp:37: 1>z:\vc\x64\include\boost/mpl/aux_/preprocessed/plain/or.hpp(58,1): error : template argument for template type parameter must be a type 1> BOOST_MPL_AUX_NA_SPEC2( 1> ^~~~~~~~~~~~~~~~~~~~~~~ 1> z:\vc\x64\include\boost/mpl/aux_/na_spec.hpp(166,44): note: expanded from macro 'BOOST_MPL_AUX_NA_SPEC2' 1> #define BOOST_MPL_AUX_NA_SPEC2(i, j, name) \ 1> ^ 1> z:\vc\x64\include\boost/mpl/aux_/na_spec.hpp(68,17): note: expanded from macro '\ 1> 1> BOOST_MPL_AUX_NA_SPEC_MAIN' 1> : name< BOOST_MPL_PP_PARAMS(i, T) > \ 1> ^~~~~~~~~~~~~~~~~~~~~~~~~ 1> z:\vc\x64\include\boost/mpl/aux_/preprocessor/params.hpp(58,11): note: expanded from macro 'BOOST_MPL_PP_PARAMS' 1> , BOOST_MPL_PP_AUX_PARAM_FUNC \ 1> ~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 1> note: (skipping 5 expansions in backtrace; use -fmacro-backtrace-limit=0 to see all) 1> z:\vc\x64\include\boost/preprocessor/cat.hpp(31,53): note: expanded from macro 'BOOST_PP_CAT_I' 1> # define BOOST_PP_CAT_I(a, b) BOOST_PP_CAT_II(~, a ## b) 1> ^~~~~~ 1> <scratch space>(33,1): note: expanded from here 1> T2 1> ^~ 1> z:\vc\x64\include\boost/preprocessor/cat.hpp(32,37): note: expanded from macro 'BOOST_PP_CAT_II' 1> # define BOOST_PP_CAT_II(p, res) res 1> ^~~ 1> z:\vc\x64\include\boost/mpl/aux_/preprocessed/plain/or.hpp(45,39): note: template parameter is declared here 1> , typename BOOST_MPL_AUX_NA_PARAM(T2) 1> ^ 1> In file included from test.cpp:16: 1> In file included from z:\vc\x64\include\boost/filesystem.hpp:16: 1> In file included from z:\vc\x64\include\boost/filesystem/path.hpp:28: 1> In file included from z:\vc\x64\include\boost/ iterator/iterator_facade.hpp:14: 1> In file included from z:\vc\x64\include\boost/ iterator/iterator_categories.hpp:15: 1> In file included from z:\vc\x64\include\boost/mpl/eval_if.hpp:17: 1>z:\vc\x64\include\boost/mpl/if.hpp(131,23): error : too many arguments provided to function-like macro invocation 1> BOOST_MPL_AUX_NA_SPEC(3, if_) 1> ^ 1> z:\vc\x64\include\boost/preprocessor/facilities/expand.hpp(26,10): note: macro 'BOOST_PP_EXPAND_I' defined here 1> # define BOOST_PP_EXPAND_I(x) x 1> ^ 1> In file included from test.cpp:16: 1> In file included from z:\vc\x64\include\boost/filesystem.hpp:16: 1> In file included from z:\vc\x64\include\boost/filesystem/path.hpp:28: 1> In file included from z:\vc\x64\include\boost/ iterator/iterator_facade.hpp:14: 1> In file included from z:\vc\x64\include\boost/ iterator/iterator_categories.hpp:15: 1> In file included from z:\vc\x64\include\boost/mpl/eval_if.hpp:17: 1>z:\vc\x64\include\boost/mpl/if.hpp(131,1): error : expected a qualified name after 'typename' 1> BOOST_MPL_AUX_NA_SPEC(3, if_) 1> ^ 1> z:\vc\x64\include\boost/mpl/aux_/na_spec.hpp(161,40): note: expanded from macro 'BOOST_MPL_AUX_NA_SPEC' 1> #define BOOST_MPL_AUX_NA_SPEC(i, name) \ 1> ^ 1> z:\vc\x64\include\boost/mpl/aux_/na_spec.hpp(154,47): note: expanded from macro '\ 1> 1> BOOST_MPL_AUX_NA_SPEC_NO_ETI' 1> #define BOOST_MPL_AUX_NA_SPEC_NO_ETI(i, name) \ 1> ^ 1> z:\vc\x64\include\boost/mpl/aux_/na_spec.hpp(64,11): note: expanded from macro '\ 1> 1> BOOST_MPL_AUX_NA_SPEC_MAIN' 1> BOOST_MPL_PP_PARAMS(i, typename T) \ 1> ^ 1> z:\vc\x64\include\boost/mpl/aux_/preprocessor/params.hpp(58,11): note: expanded from macro 'BOOST_MPL_PP_PARAMS' 1> , BOOST_MPL_PP_AUX_PARAM_FUNC \ 1> ^ 1> In file included from test.cpp:16: 1> In file included from z:\vc\x64\include\boost/filesystem.hpp:16: 1> In file included from z:\vc\x64\include\boost/filesystem/path.hpp:28: 1> In file included from z:\vc\x64\include\boost/ iterator/iterator_facade.hpp:14: 1> In file included from z:\vc\x64\include\boost/ iterator/iterator_categories.hpp:15: 1> In file included from z:\vc\x64\include\boost/mpl/eval_if.hpp:17: 1>z:\vc\x64\include\boost/mpl/if.hpp(131,1): error : expected ',' or '>' in template-parameter-list 1> z:\vc\x64\include\boost/mpl/aux_/na_spec.hpp(161,40): note: expanded from macro 'BOOST_MPL_AUX_NA_SPEC' 1> #define BOOST_MPL_AUX_NA_SPEC(i, name) \ 1> ^ 1> z:\vc\x64\include\boost/mpl/aux_/na_spec.hpp(154,47): note: expanded from macro '\ 1> 1> BOOST_MPL_AUX_NA_SPEC_NO_ETI' 1> #define BOOST_MPL_AUX_NA_SPEC_NO_ETI(i, name) \ 1> ^ 1> z:\vc\x64\include\boost/mpl/aux_/na_spec.hpp(65,9): note: expanded from macro '\ 1> 1> BOOST_MPL_AUX_NA_SPEC_MAIN' 1> BOOST_MPL_PP_NESTED_DEF_PARAMS_TAIL(i, typename T, na) \ 1> ^ 1> note: (skipping 3 expansions in backtrace; use -fmacro-backtrace-limit=0 to see all) 1> z:\vc\x64\include\boost/preprocessor/cat.hpp(22,32): note: expanded from macro 'BOOST_PP_CAT' 1> # define BOOST_PP_CAT(a, b) BOOST_PP_CAT_I(a, b) 1> ^ 1> z:\vc\x64\include\boost/preprocessor/cat.hpp(31,53): note: expanded from macro 'BOOST_PP_CAT_I' 1> # define BOOST_PP_CAT_I(a, b) BOOST_PP_CAT_II(~, a ## b) 1> ^ 1> <scratch space>(4,1): note: expanded from here 1> BOOST_PP_REPEAT_1 1> ^ 1> In file included from test.cpp:16: 1> In file included from z:\vc\x64\include\boost/filesystem.hpp:16: 1> In file included from z:\vc\x64\include\boost/filesystem/path.hpp:28: 1> In file included from z:\vc\x64\include\boost/ iterator/iterator_facade.hpp:14: 1> In file included from z:\vc\x64\include\boost/ iterator/iterator_categories.hpp:15: 1> In file included from z:\vc\x64\include\boost/mpl/eval_if.hpp:17: 1>z:\vc\x64\include\boost/mpl/if.hpp(131,1): error : template argument for template type parameter must be a type 1> BOOST_MPL_AUX_NA_SPEC(3, if_) 1> ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 1> z:\vc\x64\include\boost/mpl/aux_/na_spec.hpp(161,40): note: expanded from macro 'BOOST_MPL_AUX_NA_SPEC' 1> #define BOOST_MPL_AUX_NA_SPEC(i, name) \ 1> ^ 1> z:\vc\x64\include\boost/mpl/aux_/na_spec.hpp(154,47): note: expanded from macro '\ 1> 1> BOOST_MPL_AUX_NA_SPEC_NO_ETI' 1> #define BOOST_MPL_AUX_NA_SPEC_NO_ETI(i, name) \ 1> ^ 1> z:\vc\x64\include\boost/mpl/aux_/na_spec.hpp(68,17): note: expanded from macro '\ 1> 1> BOOST_MPL_AUX_NA_SPEC_MAIN' 1> : name< BOOST_MPL_PP_PARAMS(i, T) > \ 1> ^~~~~~~~~~~~~~~~~~~~~~~~~ 1> note: (skipping 6 expansions in backtrace; use -fmacro-backtrace-limit=0 to see all) 1> z:\vc\x64\include\boost/preprocessor/cat.hpp(31,53): note: expanded from macro 'BOOST_PP_CAT_I' 1> # define BOOST_PP_CAT_I(a, b) BOOST_PP_CAT_II(~, a ## b) 1> ^~~~~~ 1> <scratch space>(29,1): note: expanded from here 1> T3 1> ^~ 1> z:\vc\x64\include\boost/preprocessor/cat.hpp(32,37): note: expanded from macro 'BOOST_PP_CAT_II' 1> # define BOOST_PP_CAT_II(p, res) res 1> ^~~ 1> z:\vc\x64\include\boost/mpl/if.hpp(53,39): note: template parameter is declared here 1> , typename BOOST_MPL_AUX_NA_PARAM(T3) 1> ^ 1> In file included from test.cpp:16: 1> In file included from z:\vc\x64\include\boost/filesystem.hpp:16: 1> In file included from z:\vc\x64\include\boost/filesystem/path.hpp:28: 1> In file included from z:\vc\x64\include\boost/ iterator/iterator_facade.hpp:14: 1> In file included from z:\vc\x64\include\boost/ iterator/iterator_categories.hpp:15: 1>z:\vc\x64\include\boost/mpl/eval_if.hpp(67,23): error : too many arguments provided to function-like macro invocation 1> BOOST_MPL_AUX_NA_SPEC(3, eval_if) 1> ^ 1> z:\vc\x64\include\boost/preprocessor/facilities/expand.hpp(26,10): note: macro 'BOOST_PP_EXPAND_I' defined here 1> # define BOOST_PP_EXPAND_I(x) x 1> ^ 1> In file included from test.cpp:16: 1> In file included from z:\vc\x64\include\boost/filesystem.hpp:16: 1> In file included from z:\vc\x64\include\boost/filesystem/path.hpp:28: 1> In file included from z:\vc\x64\include\boost/ iterator/iterator_facade.hpp:14: 1> In file included from z:\vc\x64\include\boost/ iterator/iterator_categories.hpp:15: 1>z:\vc\x64\include\boost/mpl/eval_if.hpp(67,1): error : expected a qualified name after 'typename' 1> BOOST_MPL_AUX_NA_SPEC(3, eval_if) 1> ^ 1> z:\vc\x64\include\boost/mpl/aux_/na_spec.hpp(161,40): note: expanded from macro 'BOOST_MPL_AUX_NA_SPEC' 1> #define BOOST_MPL_AUX_NA_SPEC(i, name) \ 1> ^ 1> z:\vc\x64\include\boost/mpl/aux_/na_spec.hpp(154,47): note: expanded from macro '\ 1> 1> BOOST_MPL_AUX_NA_SPEC_NO_ETI' 1> #define BOOST_MPL_AUX_NA_SPEC_NO_ETI(i, name) \ 1> ^ 1> z:\vc\x64\include\boost/mpl/aux_/na_spec.hpp(64,11): note: expanded from macro '\ 1> 1> BOOST_MPL_AUX_NA_SPEC_MAIN' 1> BOOST_MPL_PP_PARAMS(i, typename T) \ 1> ^ 1> z:\vc\x64\include\boost/mpl/aux_/preprocessor/params.hpp(58,11): note: expanded from macro 'BOOST_MPL_PP_PARAMS' 1> , BOOST_MPL_PP_AUX_PARAM_FUNC \ 1> ^ 1> In file included from test.cpp:16: 1> In file included from z:\vc\x64\include\boost/filesystem.hpp:16: 1> In file included from z:\vc\x64\include\boost/filesystem/path.hpp:28: 1> In file included from z:\vc\x64\include\boost/ iterator/iterator_facade.hpp:14: 1> In file included from z:\vc\x64\include\boost/ iterator/iterator_categories.hpp:15: 1>z:\vc\x64\include\boost/mpl/eval_if.hpp(67,1): error : expected ',' or '>' in template-parameter-list 1> z:\vc\x64\include\boost/mpl/aux_/na_spec.hpp(161,40): note: expanded from macro 'BOOST_MPL_AUX_NA_SPEC' 1> #define BOOST_MPL_AUX_NA_SPEC(i, name) \ 1> ^ 1> z:\vc\x64\include\boost/mpl/aux_/na_spec.hpp(154,47): note: expanded from macro '\ 1> 1> BOOST_MPL_AUX_NA_SPEC_NO_ETI' 1> #define BOOST_MPL_AUX_NA_SPEC_NO_ETI(i, name) \ 1> ^ 1> z:\vc\x64\include\boost/mpl/aux_/na_spec.hpp(65,9): note: expanded from macro '\ 1> 1> BOOST_MPL_AUX_NA_SPEC_MAIN' 1> BOOST_MPL_PP_NESTED_DEF_PARAMS_TAIL(i, typename T, na) \ 1> ^ 1> note: (skipping 3 expansions in backtrace; use -fmacro-backtrace-limit=0 to see all) 1> z:\vc\x64\include\boost/preprocessor/cat.hpp(22,32): note: expanded from macro 'BOOST_PP_CAT' 1> # define BOOST_PP_CAT(a, b) BOOST_PP_CAT_I(a, b) 1> ^ 1> z:\vc\x64\include\boost/preprocessor/cat.hpp(31,53): note: expanded from macro 'BOOST_PP_CAT_I' 1> # define BOOST_PP_CAT_I(a, b) BOOST_PP_CAT_II(~, a ## b) 1> ^ 1> <scratch space>(29,1): note: expanded from here 1> BOOST_PP_REPEAT_1 1> ^ 1> In file included from test.cpp:16: 1> In file included from z:\vc\x64\include\boost/filesystem.hpp:16: 1> In file included from z:\vc\x64\include\boost/filesystem/path.hpp:28: 1> In file included from z:\vc\x64\include\boost/ iterator/iterator_facade.hpp:14: 1> In file included from z:\vc\x64\include\boost/ iterator/iterator_categories.hpp:15: 1>z:\vc\x64\include\boost/mpl/eval_if.hpp(67,1): error : template argument for template type parameter must be a type 1> BOOST_MPL_AUX_NA_SPEC(3, eval_if) 1> ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 1> z:\vc\x64\include\boost/mpl/aux_/na_spec.hpp(161,40): note: expanded from macro 'BOOST_MPL_AUX_NA_SPEC' 1> #define BOOST_MPL_AUX_NA_SPEC(i, name) \ 1> ^ 1> z:\vc\x64\include\boost/mpl/aux_/na_spec.hpp(154,47): note: expanded from macro '\ 1> 1> BOOST_MPL_AUX_NA_SPEC_NO_ETI' 1> #define BOOST_MPL_AUX_NA_SPEC_NO_ETI(i, name) \ 1> ^ 1> z:\vc\x64\include\boost/mpl/aux_/na_spec.hpp(68,17): note: expanded from macro '\ 1> 1> BOOST_MPL_AUX_NA_SPEC_MAIN' 1> : name< BOOST_MPL_PP_PARAMS(i, T) > \ 1> ^~~~~~~~~~~~~~~~~~~~~~~~~ 1> note: (skipping 6 expansions in backtrace; use -fmacro-backtrace-limit=0 to see all) 1> z:\vc\x64\include\boost/preprocessor/cat.hpp(31,53): note: expanded from macro 'BOOST_PP_CAT_I' 1> # define BOOST_PP_CAT_I(a, b) BOOST_PP_CAT_II(~, a ## b) 1> ^~~~~~ 1> <scratch space>(32,1): note: expanded from here 1> T3 1> ^~ 1> z:\vc\x64\include\boost/preprocessor/cat.hpp(32,37): note: expanded from macro 'BOOST_PP_CAT_II' 1> # define BOOST_PP_CAT_II(p, res) res 1> ^~~ 1> z:\vc\x64\include\boost/mpl/eval_if.hpp(29,39): note: template parameter is declared here 1> , typename BOOST_MPL_AUX_NA_PARAM(F2) 1> ^ 1> In file included from test.cpp:16: 1> In file included from z:\vc\x64\include\boost/filesystem.hpp:16: 1> In file included from z:\vc\x64\include\boost/filesystem/path.hpp:28: 1> In file included from z:\vc\x64\include\boost/ iterator/iterator_facade.hpp:14: 1> In file included from z:\vc\x64\include\boost/ iterator/iterator_categories.hpp:16: 1>z:\vc\x64\include\boost/mpl/identity.hpp(40,30): error : too many arguments provided to function-like macro invocation 1> BOOST_MPL_AUX_NA_SPEC_NO_ETI(1, identity) 1> ^ 1> z:\vc\x64\include\boost/preprocessor/facilities/expand.hpp(26,10): note: macro 'BOOST_PP_EXPAND_I' defined here 1> # define BOOST_PP_EXPAND_I(x) x 1> ^ 1> In file included from test.cpp:16: 1> In file included from z:\vc\x64\include\boost/filesystem.hpp:16: 1> In file included from z:\vc\x64\include\boost/filesystem/path.hpp:28: 1> In file included from z:\vc\x64\include\boost/ iterator/iterator_facade.hpp:14: 1> In file included from z:\vc\x64\include\boost/ iterator/iterator_categories.hpp:16: 1>z:\vc\x64\include\boost/mpl/identity.hpp(40,1): error : expected a qualified name after 'typename' 1> BOOST_MPL_AUX_NA_SPEC_NO_ETI(1, identity) 1> ^ 1> z:\vc\x64\include\boost/mpl/aux_/na_spec.hpp(154,47): note: expanded from macro 'BOOST_MPL_AUX_NA_SPEC_NO_ETI' 1> #define BOOST_MPL_AUX_NA_SPEC_NO_ETI(i, name) \ 1> ^ 1> z:\vc\x64\include\boost/mpl/aux_/na_spec.hpp(64,11): note: expanded from macro '\ 1> 1> BOOST_MPL_AUX_NA_SPEC_MAIN' 1> BOOST_MPL_PP_PARAMS(i, typename T) \ 1> ^ 1> z:\vc\x64\include\boost/mpl/aux_/preprocessor/params.hpp(58,11): note: expanded from macro 'BOOST_MPL_PP_PARAMS' 1> , BOOST_MPL_PP_AUX_PARAM_FUNC \ 1> ^ 1> In file included from test.cpp:16: 1> In file included from z:\vc\x64\include\boost/filesystem.hpp:16: 1> In file included from z:\vc\x64\include\boost/filesystem/path.hpp:28: 1> In file included from z:\vc\x64\include\boost/ iterator/iterator_facade.hpp:14: 1> In file included from z:\vc\x64\include\boost/ iterator/iterator_categories.hpp:16: 1>z:\vc\x64\include\boost/mpl/identity.hpp(40,1): error : expected ',' or '>' in template-parameter-list 1> z:\vc\x64\include\boost/mpl/aux_/na_spec.hpp(154,47): note: expanded from macro 'BOOST_MPL_AUX_NA_SPEC_NO_ETI' 1> #define BOOST_MPL_AUX_NA_SPEC_NO_ETI(i, name) \ 1> ^ 1> z:\vc\x64\include\boost/mpl/aux_/na_spec.hpp(65,9): note: expanded from macro '\ 1> 1> BOOST_MPL_AUX_NA_SPEC_MAIN' 1> BOOST_MPL_PP_NESTED_DEF_PARAMS_TAIL(i, typename T, na) \ 1> ^ 1> z:\vc\x64\include\boost/mpl/aux_/preprocessor/def_params_tail.hpp(97,5): note: expanded from macro 'BOOST_MPL_PP_NESTED_DEF_PARAMS_TAIL' 1> BOOST_MPL_PP_DEF_PARAMS_TAIL_IMPL(i, param, BOOST_PP_IDENTITY(=value)) \ 1> ^ 1> note: (skipping 2 expansions in backtrace; use -fmacro-backtrace-limit=0 to see all) 1> z:\vc\x64\include\boost/preprocessor/cat.hpp(22,32): note: expanded from macro 'BOOST_PP_CAT' 1> # define BOOST_PP_CAT(a, b) BOOST_PP_CAT_I(a, b) 1> ^ 1> z:\vc\x64\include\boost/preprocessor/cat.hpp(31,53): note: expanded from macro 'BOOST_PP_CAT_I' 1> # define BOOST_PP_CAT_I(a, b) BOOST_PP_CAT_II(~, a ## b) 1> ^ 1> <scratch space>(32,1): note: expanded from here 1> BOOST_PP_REPEAT_1 1> ^ 1> In file included from test.cpp:16: 1> In file included from z:\vc\x64\include\boost/filesystem.hpp:16: 1> In file included from z:\vc\x64\include\boost/filesystem/path.hpp:28: 1> In file included from z:\vc\x64\include\boost/ iterator/iterator_facade.hpp:14: 1> In file included from z:\vc\x64\include\boost/ iterator/iterator_categories.hpp:16: 1>z:\vc\x64\include\boost/mpl/identity.hpp(40,1): error : template argument for template type parameter must be a type 1> BOOST_MPL_AUX_NA_SPEC_NO_ETI(1, identity) 1> ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 1> z:\vc\x64\include\boost/mpl/aux_/na_spec.hpp(154,47): note: expanded from macro 'BOOST_MPL_AUX_NA_SPEC_NO_ETI' 1> #define BOOST_MPL_AUX_NA_SPEC_NO_ETI(i, name) \ 1> ^ 1> z:\vc\x64\include\boost/mpl/aux_/na_spec.hpp(68,17): note: expanded from macro '\ 1> 1> BOOST_MPL_AUX_NA_SPEC_MAIN' 1> : name< BOOST_MPL_PP_PARAMS(i, T) > \ 1> ^~~~~~~~~~~~~~~~~~~~~~~~~ 1> z:\vc\x64\include\boost/mpl/aux_/preprocessor/params.hpp(58,11): note: expanded from macro 'BOOST_MPL_PP_PARAMS' 1> , BOOST_MPL_PP_AUX_PARAM_FUNC \ 1> ~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 1> note: (skipping 5 expansions in backtrace; use -fmacro-backtrace-limit=0 to see all) 1> z:\vc\x64\include\boost/preprocessor/cat.hpp(31,53): note: expanded from macro 'BOOST_PP_CAT_I' 1> # define BOOST_PP_CAT_I(a, b) BOOST_PP_CAT_II(~, a ## b) 1> ^~~~~~ 1> <scratch space>(32,1): note: expanded from here 1> T1 1> ^~ 1> z:\vc\x64\include\boost/preprocessor/cat.hpp(32,37): note: expanded from macro 'BOOST_PP_CAT_II' 1> # define BOOST_PP_CAT_II(p, res) res 1> ^~~ 1> z:\vc\x64\include\boost/mpl/identity.hpp(23,39): note: template parameter is declared here 1> typename BOOST_MPL_AUX_NA_PARAM(T) 1> ^ 1>z:\vc\x64\include\boost/mpl/identity.hpp(41,30): error : too many arguments provided to function-like macro invocation 1> BOOST_MPL_AUX_NA_SPEC_NO_ETI(1, make_identity) 1> ^ 1> z:\vc\x64\include\boost/preprocessor/facilities/expand.hpp(26,10): note: macro 'BOOST_PP_EXPAND_I' defined here 1> # define BOOST_PP_EXPAND_I(x) x 1> ^ 1> In file included from test.cpp:16: 1> In file included from z:\vc\x64\include\boost/filesystem.hpp:16: 1> In file included from z:\vc\x64\include\boost/filesystem/path.hpp:28: 1> In file included from z:\vc\x64\include\boost/ iterator/iterator_facade.hpp:14: 1> In file included from z:\vc\x64\include\boost/ iterator/iterator_categories.hpp:16: 1>z:\vc\x64\include\boost/mpl/identity.hpp(41,1): error : expected a qualified name after 'typename' 1> BOOST_MPL_AUX_NA_SPEC_NO_ETI(1, make_identity) 1> ^ 1> z:\vc\x64\include\boost/mpl/aux_/na_spec.hpp(154,47): note: expanded from macro 'BOOST_MPL_AUX_NA_SPEC_NO_ETI' 1> #define BOOST_MPL_AUX_NA_SPEC_NO_ETI(i, name) \ 1> ^ 1> z:\vc\x64\include\boost/mpl/aux_/na_spec.hpp(64,11): note: expanded from macro '\ 1> 1> BOOST_MPL_AUX_NA_SPEC_MAIN' 1> BOOST_MPL_PP_PARAMS(i, typename T) \ 1> ^ 1> z:\vc\x64\include\boost/mpl/aux_/preprocessor/params.hpp(58,11): note: expanded from macro 'BOOST_MPL_PP_PARAMS' 1> , BOOST_MPL_PP_AUX_PARAM_FUNC \ 1> ^ 1> In file included from test.cpp:16: 1> In file included from z:\vc\x64\include\boost/filesystem.hpp:16: 1> In file included from z:\vc\x64\include\boost/filesystem/path.hpp:28: 1> In file included from z:\vc\x64\include\boost/ iterator/iterator_facade.hpp:14: 1> In file included from z:\vc\x64\include\boost/ iterator/iterator_categories.hpp:16: 1>z:\vc\x64\include\boost/mpl/identity.hpp(41,1): error : expected ',' or '>' in template-parameter-list 1> z:\vc\x64\include\boost/mpl/aux_/na_spec.hpp(154,47): note: expanded from macro 'BOOST_MPL_AUX_NA_SPEC_NO_ETI' 1> #define BOOST_MPL_AUX_NA_SPEC_NO_ETI(i, name) \ 1> ^ 1> z:\vc\x64\include\boost/mpl/aux_/na_spec.hpp(65,9): note: expanded from macro '\ 1> 1> BOOST_MPL_AUX_NA_SPEC_MAIN' 1> BOOST_MPL_PP_NESTED_DEF_PARAMS_TAIL(i, typename T, na) \ 1> ^ 1> z:\vc\x64\include\boost/mpl/aux_/preprocessor/def_params_tail.hpp(97,5): note: expanded from macro 'BOOST_MPL_PP_NESTED_DEF_PARAMS_TAIL' 1> BOOST_MPL_PP_DEF_PARAMS_TAIL_IMPL(i, param, BOOST_PP_IDENTITY(=value)) \ 1> ^ 1> note: (skipping 2 expansions in backtrace; use -fmacro-backtrace-limit=0 to see all) 1> z:\vc\x64\include\boost/preprocessor/cat.hpp(22,32): note: expanded from macro 'BOOST_PP_CAT' 1> # define BOOST_PP_CAT(a, b) BOOST_PP_CAT_I(a, b) 1> ^ 1> z:\vc\x64\include\boost/preprocessor/cat.hpp(31,53): note: expanded from macro 'BOOST_PP_CAT_I' 1> # define BOOST_PP_CAT_I(a, b) BOOST_PP_CAT_II(~, a ## b) 1> ^ 1> <scratch space>(61,1): note: expanded from here 1> BOOST_PP_REPEAT_1 1> ^ 1>CL : fatal error : too many errors emitted, stopping now [-ferror-limit=] 1> 20 errors generated. ========== Rebuild All: 0 succeeded, 1 failed, 0 skipped ========== Up till now I was using a hacked boost-1.62. So in order to see what would happen, I also built boost-1.63. Apart from a small change in type_with_alignment.hpp (adding a ckeck for _MSC_VER not to exist if __clang__ does exist in line 87), boost-1.63 compiles without a problem (no specific (relevant to the emulation) command line parameters). Is there a macro I should define or is there something else I should set/do in order to use boost-1.64 with Clang 4.0.0 on windows? Any other suggestions? degski -- "*Ihre sogenannte Religion wirkt bloß wie ein Opiat reizend, betäubend, Schmerzen aus Schwäche stillend.*" - Novalis 1798

1 1

[Range, Phoenix] What am I missing...
by Robert Jones 25 Apr '17

25 Apr '17

Hi Folks Can anyone explain the output of this program... #include <iostream> #include <boost/range/algorithm/copy.hpp> #include <boost/range/counting_range.hpp> #include <boost/range/adaptor/reversed.hpp> #include <boost/range/adaptor/transformed.hpp> #include <boost/phoenix/bind/bind_function.hpp> #include <boost/phoenix/core/argument.hpp> int f( int i ) { return i * 2; } int main( ) { using boost::adaptors::reversed; using boost::adaptors::transformed; using boost::counting_range; using boost::copy; using boost::phoenix::arg_names::_1; copy( counting_range( 1, 5 ) | reversed | transformed( f ), std::ostream_iterator<int>( std::cout, " " ) ); std::cout << std::endl; copy( counting_range( 1, 5 ) | reversed | transformed( bind( f, _1 ) ), std::ostream_iterator<int>( std::cout, " " ) ); std::cout << std::endl; } Which is... 8 6 4 2 1768406272 1768406272 1768406272 1768406272 I'm using Gcc 4.6.2 & Boost 1.53 Thx All.

3 4

[Serialization] issue with "Assertion `__null != bpos' failed"
by Francois Mauger 24 Apr '17

24 Apr '17

Hi Robert, all, In some of our libs, we use serialization through a base pointer: We have a base (abstract) class "a::base" which is available from a shared library "liba". We have created a new class "b::foo", inherited from "a::base", hosted in another shared lib "libb", "libb" being explicitly linked to "liba". In "libb", class "b::foo" is exported through : BOOST_CLASS_EXPORT_KEY2(b::foo,"b::foo") (in header foo.hpp) BOOST_CLASS_EXPORT_IMPLEMENT(b::foo) (in some libb's foo-serial.cpp source file) which I think is the right way to process to register a class in a compilation unit. In a test program, I (de)serialize 'b::foo' instances through a 'a::base' pointer. This mechanism has worked for years in all of our software chains. And today it works with our current production software system (ubuntu linux 16.04, g++ 5.4.0, GNU ld 2.26.1, Boost 1.60). However, we now face a runtime error on *some* of our boxes. The message is: <pre> ...test_app...: /path/to/boost/install/include/boost/archive/detail/oserializer.hpp:436: static void boost::archive::detail::save_pointer_type<Archive>::polymorphic::save(Archive&, T&) [ with T = a::base; Archive = boost::archive::xml_oarchive]: Assertion `__null != bpos' failed. Abort (core dumped) </pre> This error only occurs with XML or txt archives, but works like a charm with Christian's EOS portable binary ars. What is strange is that the code works on some of our systems but failed on other ones with the same compiler/linker/boost versions. The exception suggests some problem with class registration but I don't understand this (apparently) arbitrary behaviour. If any of you have a hint to help us to find the solution, it would be appreciated. thanks regards -- François

1 0

really dumb question about quickbook
by Robert Ramey 21 Apr '17

21 Apr '17

I'm struggling with quickbook When I use the following [section:userapi User API] [include types/File.qbk] [include types/Hasher.qbk] [include types/Progress.qbk] [endsect] I don't the files included. But when I use [section:userapi User API] [include types/File.qbk] [include types/Hasher.qbk] [include types/Progress.qbk] [endsect] The other files ARE included. I've looked through the quickbook docs and for the life of me I can't find where the significance (if there is any) of spaces in the markup is explained. Could someone point me in the right direction? Robert Ramey

4 18

[Boost-CRC] Warnings in crc_32_type
by tamas.ruszkai＠leica-geosystems.com 21 Apr '17

21 Apr '17

1 0

[release] Boost 1.64.0
by Rene Rivera 20 Apr '17

20 Apr '17

Release 1.64.0 of the Boost C++ Libraries is now available. These open-source libraries work well with the C++ Standard Library, and are usable across a broad spectrum of applications. The Boost license encourages both commercial and non-commercial use. This release contains one new library and numerous enhancements and bug fixes for existing libraries. For details, including download links, see < http://www.boost.org/users/history/version_1_64_0.html> You can also download directly from: < https://dl.bintray.com/boostorg/release/1.64.0/> To install this release on your system, see < http://www.boost.org/doc/libs/release/more/getting_started/index.html> Thanks to everyone who participated in this release. Thanks, -- The Boost Release Team Vladimir Prus, Rene Rivera, Marshall Clow, Eric Niebler, Daniel James, Beman Dawes

3 2

[hana] create aribtrary tuples of integral_constants
by Steve Lorimer 19 Apr '17

19 Apr '17

Making use of Scott Schurr's str_const ( https://github.com/boostcon/cppnow_presentations_2012/blob/master/wed/schur…) I have a constexpr string. class StrConst { public: template<size_t N> constexpr StrConst(const char (&str)[N]) : str_(str) , len_(N - 1) { static_assert(N > 1, "not a string"); } constexpr operator const char*() const { return str_; } constexpr size_t size() const { return len_; } constexpr char operator[] (size_t i) const { return i < len_ ? str_[i] : throw std::out_of_range("invalid index"); } private: const char* const str_; const size_t len_; }; I have another constexpr function which returns the position of the first caret found in a string, starting from position n: constexpr int caretPos(const StrConst& str, size_t n = 0) { if (n == str.size()) return -1; if (str[n] == '^') return n; return caretPos(str, n+1); } I can use the results of caretPos to create a typedef for a std::tuple of std::integral_constants, where the size of the tuple is the number of carets found in the string, and each tuple element is an integral constant whose value is the position of the caret in the string. Here I manually construct this tuple: int main() { constexpr StrConst s("hello^world^"); constexpr int pos1 = caretPos(s); constexpr int pos2 = caretPos(s, pos1+1); using P1 = std::integral_constant<int, pos1>; using P2 = std::integral_constant<int, pos2>; using PosTuple = std::tuple<P1, P2>; static_assert(std::tuple_element_t<0, PosTuple>::value == 5, ""); static_assert(std::tuple_element_t<1, PosTuple>::value == 11, ""); } Question: I would now like to generalise this for any input string with any number of carets. template<size_t... Ns> using PosTuple = std::tuple<std::integral_constant<int, Ns>...>; How can I generate the sequence of Ns... required here using caretPos or some other means?

2 1

[release] Boost 1.64.0 Release Candidate 1
by Rene Rivera 17 Apr '17

17 Apr '17

The release candidates for the 1.64.0 release are now available at: <https://dl.bintray.com/boostorg/beta/1.64.0.rc.1/> The SHA256 checksums are as follows: 49c6abfeb5b480f6a86119c0d57235966b4690ee6ff9e6401ee868244808d155 boost_1_64_0_rc1.7z 7bcc5caace97baa948931d712ea5f37038dbb1c5d89b43ad4def4ed7cb683332 boost_1_64_0_rc1.tar.bz2 0445c22a5ef3bd69f5dfb48354978421a85ab395254a26b1ffb0aa1bfd63a108 boost_1_64_0_rc1.tar.gz b99973c805f38b549dbeaf88701c0abeff8b0e8eaa4066df47cac10a32097523 boost_1_64_0_rc1.zip As always, the release managers would appreciate it if you download the candidate of your choice and give building it a try. Please report both success and failure, and anything else that is noteworthy. -- The Boost Release Team -- -- Rene Rivera -- Grafik - Don't Assume Anything -- Robot Dreams - http://robot-dreams.net -- rrivera/acm.org (msn) - grafikrobot/aim,yahoo,skype,efnet,gmail

2 1